TECHNICAL ASSISTANCE SERVICE
40
Boiler connected to a timer, parameter 51 set to 1 (parameter only editable using the remote control)
With the contacts closed, heat requests are generated by the flow temperature sensor on the basis of outdoor tempera-
ture, to achieve a nominal room temperature at DAY level (20°C). When the contacts open, the boiler does not switch off
but reduces the heating curve (by performing a parallel shift) to NIGHT level (16°C). This activates night mode heating.
The boiler calculates the necessary CH flow temperature automatically, though the user can adjust the boiler settings.
The CENTRAL HEATING temperature selector, however, does not give the user control over the CENTRAL HEATING SET
POINT as such, but only permits variation within a range b5 and -5°C. Changing this value does not directly
change the temperature of the CH flow. Instead, it changes the reference temperature (0 = 20°C for DAY level, 16°C for
NIGHT level), and modifies the calculation that determines flow temperature automatically.
90
80
70
60
50
40
30
20
10
Flow temperature (°C)
Outdoor temperature (°C)
20
15
10
5
0
-5
-10 -15 -20
PARALLEL SHIFT NIGHT-TIME REDUCTION
DAY heating curve
NIGHT heating curve
